RENPHO Electric Percussion Massager has a powerful motor, long-lasting Li-ion battery, and is made out of high quality ABS plastic. It can effectively help you relieve aches and pains on your body. It features a variable-speed powerful motor that manually adjusts the intensity to match your preference. This device also has four modes; it utilizes red light therapy to aid in pain relief, muscle recovery, and promotion of blood circulation without a prescription.